Water trapped between hull and ski locker subfloor

[98outback]

I took this pic of the box area of the ski locker and it looks like some work was done there before I got the boat. Im not sure if it came from the factory like this or a dealer did it at some time. Could be where they tried to fix it but there was still water under the floor. Notice the different colors of the black. I have also heard that when people remove their gas tank that the fiberglass/gelcoat is cracked around the drain hole from the ski locker to the bilge. That could very well be where some water is getting down into the hull.